Triple-acting, force, suction, and vacuum pump



Jan. 4, 1927.

C. G. WAHLSTROM TRIPLE AcTNG,

FORCE, SUCTION, AND VACUUM PUMP l -H\ uw I l Patented Jan. 4, 1927.

i irma CHARLES G. WAHLSTROM, OF DALLAS, TEXAS.

TRIPLE-ACTING, FORCE, SUCTlON, AND VACUUM PUMP..

Application filed January 6, 1825.

This invention relates to pumps and especially to the new and novel construction whereby the pistons are made to ascend and descend either singly or in pairs. It relates also to the novel way by which the apparatus can be kept clean and free from obstructions.

The principal object oi' the invention is to provide a most powerful apparatus for pumping where conditions require very great torce or suction by employing the screw-thread principle for the raising and loweringl of the pistons.

Another object ot' the invent-ion is to provide a pump with a self cleaning feature, whereby an oil or other well and the working parts ot the pump may be kept .tree from congestion through extraneousV inatter.

The pump is of tew parts and can be operated etl'ectively with a single piston or with a pair of pistons or with several pistons and is of an economical n'ianufacture.

The invention will be more fully understood by the following description and accon'ipanying drawings which form a part liereot', and in which:

Fig. 1 is a vertical sectional view ot the pump, illustrating the cylinder, the pistons and the piston rod in one position.

Fig. 2 is a similar view illustrating the reverse position ot' the pistons and piston rod and showing the two pairs ol pistons drawn together.

Fig. 3 is a vertical sectional view illustrating the upper andthe lower parts of the invention.

F ig. 4ris a vertical sectional view illustrating a cylinder and a piston in position to descend and also showing a section o'f the piston rod.

Fig. 5 is a cross sectional 'View at line A-A. in Fig. 4 illustrating the inner and the outer tln'eadings of the pistons, and the spiral opening at the lower end through which the fiuid passes.

Referring more in detail to the drawings:

1 denotes the cylinder shaped and threaded to tit pistons 5"y and 5b, forming stages or pumping units, placed at required heights in well and connected with one another by tubings or pipes (not shown in the drawings) forming a continuous whole.

2 denotes the outlet of fluid.

roller 11.

Serial No. 880.

3 denotes the piston rod shaped and threaded to the inner side of pistons 5, the piston rod is also extended by tubings in like manner with cylinders, forming a continuous channel tor steam or fluid to be forced down, into the bottom ot pump through the periiorations 4. i

5 denotes the pumping-pistons with the outer side threaded to the cylinder and the inner side threaded to the piston rod, always reversing the threading so that when the outer threading is right turn the inner threading 3a is lett turn. The outer threading ot the reciprocating piston 5b is left turn and the inner threading 3b isV right turn. rEhe pistons have an open space 5, in Figs. l and 5, which runs spirally parallel with the inner threading, allowing passage for the fiuid. The open chamber 5d in Fig. 4. provides free vertical motion of pistons.

6 denotes a valve which opens when pistony descends and closes when piston ascends. A valve may be placed either at the top or at the bottom or at both places in the pistons. I

7 denotes valve-guards.

8 denotes piston rings to prevent leakage.

9 denotes a sprocket-wheel fastened to the piston rod 3 and is geared to l() which denotes a rod leading from the source of motive-power. This rod is held in place by 12 denotes a trame carrying' the `pump and holding the parts in place.

13 denotes a means ot connecting a steampipe 14 with the piston rod and providing a joint with freedom otrotationary motion. y

15 denotes apertures for ingress ot fluid.

The operations oi' the invention may be more fully understood by the following explanations.

When motive power is applied to rod 10, causing a right-turn rotary motion of wheel 9, and this in turn rotary motion of piston rod 3, a three-fold action of piston 5b is brought about. First, a rotating motion, somewhat slower than that of the piston rod. Second, an ascending motion. by means oi" the inner right-turn threading. Third, this 4rotating motion causes a further and theV main lifting-action to take place by means ofthe outer or left-turn threading of the piston. While this ascending motion takes place with piston 5b, a simultaneous and lill iii

ll i) the piston rod 3 is reversed, and as a consequence thereof the pistons 5, Fig. l, having now been charged with a new load ol fluid, commence their upward journey foreing their charge up through the descending pistons 5l next ahove. The pistons 5a are also siniultaneously sucking more fluid up through the descending piston 5b next below.

The principal improven'ients over my Le"- ters Patent #1,5l3ll2, issued October 25, 1924i, reside in the spiral or equivalent connections between the piston rod and the pistons, whereby said pistons are rotated in opposite directions as they reciprocate toward and 'from each other, thereby producing greater eliieiency; together with the opposite screw-threads or spirals between the cylinders and the pistons which give a longer and more powerful strolfze.

It should be understood that moditications and cl'ianges may be made in the construction to adapt the pump to the various conditions and usages comingwithin the Vmeaning and spirit ol the fol-lowing claims:

1. A pump for oil Wel-ls and the like including a cylinder,1 formed with an inlet at its lower end for subinersion in the Well, a piston rod in the cylinder, a plurality ot pairs of pistons carried by the rod, each piston having a spiral thread. ineens carried by the cylinder and received in the threads of the pistons for reciprocating the latter upon rotation ot the piston rod, a valve controlled port in each piston, said threads ot the pistons ot each pair being arranged so that upon, rotation oi the lrod said pistons Will have an alternate aplyroachin-g and receding movement and the adjacent pistons of the adjacent pairs of pistons` will have a.

like alternate approaching and receding movement so as to provide continuous :flow of the Huid being pumped, and means on the piston rod engaging the pistons for roteting those ol each pair in opposite directions.

2. A pump for oil wells and the like including a cylinder, Jformed 'with an inlet at its lower end for submersion in the well, a piston rod in the cylinder, a plurality ot )airs ot iistons carried b the rod each )isi ton having a spiral thread, means carried by the cylinder and received in the threads of the pistons for reciprocating the latter upon rotation ot the piston rod, a valve controlled port in each piston, said threadi-i ot the pistons ot each pair being arranged so that upon rotation ot the rod said pistons will have an alternate approruzhing and receding n'iovenient and the adjacentpistons oi' the adjacent pairs o't pistons will have a like alternate approaching and rrceiling movement so as to provide continuons lion' lll) ot' the fluid being pumped, and spiral threads on the piston rod. the rod thread Ylor earh piston being opposite to its thread on n1; surface.

A pu'inp for oil wells and the like including a. cylinder, termed with an inlet at its lower end 'l'or subn'iersion in the Well, a piston rod in the cylinder, a plurality ot' pairs of valved pistons carried by the rod, spiral threads carried by the cylinder or reciprocating the pistons upon rotation oi the piston rod, and spiral threads on the pistons for engaging the lirst threads Wherehy the pistons are reeiprocated, and spiral CHARLES G. VSTAHLSTROM. 

